chore(release): add release notes for 2.40.0-rc3

[armory-astrolabe]

Event

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  "prerelease": true,
  "stack": {
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    },
    "dependencies": {
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        "commit": null,
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      }
    },
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      }
    },
    "timestamp": "2026-07-09 01:34:57",
    "version": "2.40.0-rc3"
  }
}